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C. H, W. MORRISON ELECTRIC HEATER May 22, 1923. 1,456,141

Filed July 1o. 1922 Patented Mey 22,

UNITE STATES PATENT OFFICE.

CHARLES HOWARD ViiLTER l'i'QOREISON, OE LONDON, ENGLAND. ASSIGNOR, BY DIRECT AND ETESNE ASSIGNBCKENTS, TO M. Sz; P. ENTERPRISES LIMITED, OF LONDON, W. 1, ENGLAND, AND VJLLAL HERBERT PEAK, LONDON, 'W'. '14, ENGLAND.

ELECTRIC HEATER.

Application filed July l0, 1922.

c. it known that l, @momias Howlnn /ionr/.isom a subject ot the Kino` of nn :ind l'reland, and e resident .innglenth have invented certain new and useL al Improvements in Electric lleaters olf which the following' is a specifi cation.

This inve .on which relates to improvements .in electric heating` devices is snit- :ihle toi' h ing' small queiititi s o't liquid or sen'iifliqnid suhstances, tools or other appliances` :ind also i'or empor-ating chemical compounds es iees. p or other substances havi ai.. .,ptie properties, so that hv vnporiza tion the ..id compounds or substances he more readili7 disseminati 'il through the atniosiiihcro for lrvgienic purposes.

The has reference to el ctric heat@ wherein electric resistance eleineiis mounted on a hose with reniovahle cover plate over the terminals are covered h f :in outer shell shaped with c. Cup-hize eavitv disposed over the elements.

According; to the present invention there is eniploved a hose on which stonfls a pair oF upright conductive leffs corr/'ing detacln ahlv between their upper ends thc resistance heatingn element, and a Cover with a cup-like depression on its uppe:1 surtacc.

The improved device accordino` to this invention onihodies novel construction with inciiities tor easily detaohing :ind replacingthc heating` elements. and illustrated in the accompanying drawings.

Figure l is a vcrtifg-al section, and

Figui-c o plen view, the metal cover having; heen renioif'ed,

The hase nifty he of vf'ood, vulcanite, chonite, or other insulator. and suitable means are provided "for bringing' a twin '0 rihle (fehle through the hase for lea( current to the heating elements. hase consists ci two pieces. a. top oart l,

which holds the elements and their supports and a l 'the Serial No. 573,955.

known nianner preferably narrow in coinparison with their length, and these strips are securely held in two metal end pieces or lugs 7 which forni the terniinals of the elements. The element vrire is preferably continuous throughout but met* he arranged in sections adapted tor joining together. The elements with their nietnl end pieces forni a complete unit which can he easil;r replaced in case of hreahdown. The end pieces are fixed to the hase by means of long metal screws oi' holts which project through the hase into the hollow space therein and forni the niain terminals 5 ot tlg apparatus, to woich terminals a pair ot flexible cables 4 is connected.

A piece of sheet asbestos 8 or other lireproof and insulating' material is placed loetwcon the elements and the hase.

The metal cover 3 which may he provided with holes toi' ventileting purposes is ot pressed or spun metal and performs the dual function o'f n mechanical protection 'For the elements and a support or holder 'for the vessels or appliances to he heated hjf nieans of the cup-shaped cavityv which can also contain the vaporising chemicals. rlhis cavitf,7 is arranged immediatelj,7 above the elements so that veri7 lit-le heat is lost in transmission from the elements to the liquid in the cavity. ln order to prevent snch loss more eillectinilly, the elements niav he disposed concentricallv with and under the cavit;7 i. e. they may he benty into cup-shaped forni so that all ports of. the heating elements may he as close as possible to the under side ot the cavity.

claim- An electric heating :ipplianco consisting or a hase, upright conductor leg-s on the upper side ot said hase, terminal elements the line wires and constitntinc` nicans tor fastening the conductor legis to the hase, 

